Since yesterday WMT reports a line unreachable dns, robots.txt and domains though everything has been running since ages without issues and also showing up fine.
aakk9999
10:30 am on Mar 29, 2016 (gmt 0)
It could be a bug in WMT. Have you tried "Fetch as Googlebot" from WMT? What result do you get?
lucy24
8:13 pm on Mar 29, 2016 (gmt 0)
Generic advice for anything you see in WMT: Ignore it and see if it goes away.
night707
6:11 am on Mar 30, 2016 (gmt 0)
Thanks a lot Lucy and aakk9999 Google fetch does work and the urls get submitted. However also today WMT reports no dns, no robots.txt though the domains can be reached